The invention relates to a sealing device for repair of cardiac and vascular defects or tissue opening such as a patent foramen ovale (PFO) or shunt in the heart, the vascular system, etc. and particularly provides an occluder device and trans-catheter occluder delivery system. The sealing device would have improved conformity to heart anatomy and be easily deployed, repositioned, and retrieved at the opening site. The sealing device comprises an expandable frame (200) consisting of 5 nitinol wires extending from a proximal end to a distal end of the frame (200) wherein nitinol comprises 10 % by weight platinum and is drawn filled nitinol. The wires form a proximal eyelet (202), an intermediate eyelet (203) and a distal eyelet (204). The sealing device further comprises a sealing member (508) at least partially encapsulating the expandable wire frame. The sealing member is thin material of ePTFE adhered to the frame by the FEP adhesive.
